And the truth is finally REVEALED!!!
[Image via Kylie Jenner/Instagram.]
OMG! This video is enough to prove moving The Tonight Show back to New York was a great idea!
The Mad Man and the late night funny man joined forces for some hi jinx high atop 30 Rockefeller Plaza this week!
Jimmy and Jon waited until just the right moment and then jumped into the background of some family photos without them ever realizing they were there!
It went beyond just making funny faces into the camera though.
The guys went so far as to eat a sub sandwich Lady and the Tramp style in one pic!
Annnnnnd we die!
Press PLAY (above) to watch our new favorite comedy duo Fallon and Hamm ham it up in some surprise photobombs!
And CLICK HERE to view some other unbelievable celebrity photobombs!